Magnetic properties of LiCu3O3: A quasi-two-dimensional antiferromagnet on a depleted square lattice

A. A. Bush, S. K. Gotovko, V. Yu. Ivanov, V. I. Kozlov, E. G. Nikolaev, and L. E. Svistov
Phys. Rev. B 109, 115151 – Published 25 March 2024

Abstract

LiCu3O3 is a novel two-dimensional S=1/2 antiferromagnet with randomly depleted square lattice. The crystal structure contains two types of square planes with different Cu2+Li+ substitution rates (20% and 40%). Li7 NMR and magnetization measurements performed on single crystals of LiCu3O3 revealed the occurrence of magnetic order at Tc1=123K and the change of the magnetic state at Tc230K. The high-temperature transition can be attributed to establishment of magnetic order in planes with higher concentration of magnetic ions and the low-temperature transition to the magnetic ordering in planes with lower concentration of magnetic ions. Broad continuous NMR spectra below Tc1 reflect a continuous distribution of values or directions of magnetic moments in LiCu3O3 typical for spiral, spin-modulated magnetic structures or structures with frozen disorder. Magnetization measurements revealed a spin-flop transition which indicates weak uniaxial anisotropy of the spin structure. The relatively small magnetic susceptibility at all orientations of applied magnetic field shows that the magnetic structure is rigid since the estimated value of saturation field derived from differential susceptibility measured at μ0H=5T is μ0Hsat200T.

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  • Received 20 December 2023
  • Accepted 28 February 2024

DOI:https://doi.org/10.1103/PhysRevB.109.115151

©2024 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. A. Bush1, S. K. Gotovko2,3, V. Yu. Ivanov4, V. I. Kozlov1,2, E. G. Nikolaev2,*, and L. E. Svistov2,†

  • 1MIREA - Russian Technological University, Moscow 119454, Russia
  • 2P.L. Kapitza Institute for Physical Problems, RAS, Moscow 119334, Russia
  • 3National Research University Higher School of Economics, Moscow 101000, Russia
  • 4Prokhorov General Physics Institute, RAS, Moscow 119991, Russia

  • *nikolaev@kapitza.ras.ru
  • svistov@kapitza.ras.ru

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Issue

Vol. 109, Iss. 11 — 15 March 2024

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